Customizer Settings and fields

Hi,
I've set up a customizer section using MB Settings and using the following code:

add_filter( 'mb_settings_pages', 'wcpp_masthead_text' );

function wcpp_masthead_text( $settings_pages ) {
	$settings_pages[] = [
        'menu_title'      => __( 'Homepage Intro', 'wcpp' ),
        'id'              => 'homepage-masthead-text',
        'capability'      => 'edit_published_pages',
        'option_name'   => 'theme_mods_masthead_text',
        'style'           => 'no-boxes',
        'columns'         => 1,
        'customizer'      => true,
        'customizer_only' => true,
        'network'         => false,
    ];

	return $settings_pages;
}

add_filter( 'rwmb_meta_boxes', 'wcpp_masthead_field' );

function wcpp_masthead_field( $meta_boxes ) {
    $prefix = '';

    $meta_boxes[] = [
        'title'          => __( 'Homepage Intro Text', 'wcpp' ),
        'id'             => 'homepage-masthead-wysiwyg',
        'settings_pages' => ['homepage-masthead-text'],
        'fields'         => [
            [
                'name'              => __( 'Masthead Text', 'wcpp' ),
                'id'                => $prefix . 'masthead_text',
                'type'              => 'wysiwyg',
                'raw'               => false,
                'required'          => false,
                'clone'             => false,
                'hide_from_rest'    => false,
                'hide_from_front'   => false,
                'limit'             => 150,
                    'wpautop' => false,
                'limit_type'        => 'character',
                'options'         => [
                    'media_buttons' => true,
                    'teeny'         => false,
                    'tinymce'       => [
                        'toolbar1' => 'bold,italic,underline,|,bullist,numlist,|,link,unlink',
                        'toolbar2' => '',
                        'toolbar3' => '',
                        'toolbar4' => '',
                        'toolbar5' => '',
                        'wpautop' => false,
                    ],
                    'quicktags'    => false,
                ],
            ],
        ],
    ];

    return $meta_boxes;
}

This works fine and I can retrieve the content, but in order to get to the fields in the Customizer, I have to click on 'Homepage Intro', which then shows me the 'Homepage Intro Text' accordion control, which I have to click in order to see the WYSIWYG field.

How can I set it up so I get straight to the fields on the first click, ie, on clicking 'Homepage Intro', like the default WordPress controls?

Also, could I allow users to add content using Blocks (standard WP blocks rather than anything created using MB Blocks) instead of the WYSIWYG in the customizer?